Abstract: At present,power of communication system is mostly supplied by uninterrupted battery,but the resulting high temperature will affect battery working efficiency and life.This paper,taking microcontroller C8051F04 as control core,through modular design and by mounting control panel in STD standard case,achieves reliable performance and convenient maintenance.The on-line monitoring of the UPS battery marking temperature and environmental temperature is realized.As a result,valve-control sealed lead-acid battery temperature detection circuit is fulfilled.Through analyzing the temperature testing data,the repair and process of the fault battery are realized.

Key words: UPS battery, on-line temperature monitoring, C8051F040